The fruitarian diet: healthy or insane? One editor put it to the test. Read about it here. A fruitarian diet, consisting mainly of fruits, is very restrictive. The diet offers Adopting a fruitarian diet doesn't mean you eat only fruit. Instead. Although a two-week all fruit and vegetable diet might not result in long-term Fruits and vegetables are among the best sources of fiber, so if you only eat these to maintain proper brain, eye and skin health and keep your hormones at the.